﻿namespace 开放封闭原则
{
    public interface IBuyJiJin
    {
        public void GetBuyJiJin();
    }
    public class BuyJiJin : IBuyJiJin
    {
      public  void GetBuyJiJin()
        {
            Console.WriteLine("处理用户的购买基金");
        }
    }
}
